Materials Literature
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The self-assembly of the complementary components AP2 and AU2, through hydrogen bonding via uracil and 2,6-diacylaminopyridine groups, yields polymeric supramolecular rigid rods (AP2, AU2)n that present a lyotropic mesophase.
A Crystalline mesoporous member of the MCM-41 family has been synthesised with a Si : Al ratio as low as 8.5 : 1, without observing octahedral aluminium.
The use of surfactants as templates allows the synthesis of mesostructured transition-metal oxides by a cooperative, interface controlled condensation process.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolystyrene-poly(methacrylic acid) block copolymer micellesAnwei Qin, Minmin Tian, C. Ramireddy, Stephen E. Webber, Petr Munk, and Zdenek TuzarCite this: Macromolecules 1994, 27, 1, 120–126Publication Date (Print):January 1, 1994Publication History Published online1 May 2002…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlatinum complex [(en)Pt(uracilate)]44+: a metal analog of calix[4]arene. Similarities and differences with classical calix[4]arenesHolger Rauter, Edda C. Hillgeris, Andrea Erxleben, and Bernhard LippertCite this: J. Am. Chem. Soc. 1994, 116, 2, 616–624Publication Date (Prin…
Synroc is an advanced titanate ceramic comprising an assemblage of phases chosen for their compatibility, geological/geochemical stability and collective ability to immobilise the various elements and radionuclides present in high-level nuclear wastes. A major technical advantage of the Synroc strategy is that it poss…
A new technology to vulcanize natural rubber latex by radiation has been developed. Environmental advantages of the technology over conventional sulfur vulcanization are 1) absence of nitrosamines, 2) low emission of SO2 on combustion and 3) degradability in the environment. These advantages which come from the fact t…
The diffusivity of hydrogen and deuterium in palladium has been measured at temperatures between 773 and 1373 K and at hydrogen and deuterium concentrations less than 10–4 H/Pd and D/Pd (atomic ratio). The measured diffusion coefficients for hydrogen (DH) and deuterium (DD) showed Arrhenius behaviour. The dependence o…
The melting line of graphite has been investigated using a method of flash‐heating of small rod of graphite by discharging a bank of capacitors in a 6–8 anvil type high pressure apparatus. The changes of enthalpy of graphite up to the melting point were obtained from the heating energy inserted from a bank of capacito…
The performance characteristics of the ZnO‐Bi 2 O3‐based varistors can be assessed to meet the applications criteria on the basis of a systematic evaluation corresponding to various experimental conditions. This evaluation process employs the lumped parameter/complex plane analysis technique for the ac small‐signal im…
An unsymmetrical donor 4,5-ethylenedithio-4′,5′-(2-oxatrimethylenedithio)-diselenadithiafulvalene (EOST)† has been synthesized. Single crystals of some charge-transfer salts of EOST have been prepared electrochemically. The crystal structures of EOST and its charge-transfer salts were analysed by X-ray crystallography…
An approximate theoretical model of foam spreading on a liquid surface has been formulated. The model is analogous to the spreading of oil slicks on water surfaces. Viscous friction is assumed to be the dominating mechanism in opposing the foam spread. The friction is described by a lumped friction constant. The sprea…
Aconeceras trautscholdi ammonitellae mass occurring in the Aptian of Symbirsk, central Russia represent consecutive calcification stages of the primary organic shell wall. Already after the formation of the organic shell with proseptum, the first whorl and umbilical walls of the initial chamber were calcified, then th…
The pyrrole-based cryptand L, has asymmetric conformation when coordinated to dicopper(I); one-electron oxidation yields a localized mixed-valence dicopper cryptate of the singly deprotonated ligand and two-electron oxidation a dicopper(II) cryptate of the triply deprotonated ligand; single crystal X-ray structure det…
This is a review of glass transition temperature (Tg) measurements of materials by differential scanning calorimetry (DSC). Tg is noted in DSC derived heat capacity (Cp) plots against temperature as the jump in Cp or (∆Cp) that occurs usually over a temperature interval of a few tens of degrees (°C). Under conditions…
Abstract The structure and organization of the organic matrix of the cusps of the major lateral teeth of the chiton Acanthopleura hirtosa have been examined using conventional light and transmission electron microscopy techniques and by using the protein ferritin as an ultrastructural probe. The results show major str…
There are two polymorphic forms of racemic thalidomide. The α-polymorph was formed by crystallization from 2-ethoxyethanol, methanol or dichloromethane, while the β-polymorph was formed by crystallization from a supersaturated solution in refluxing 2-ethoxyethanol. The two polymorphs were characterized by IR spectra,…
The adsorbed species on ZrO2 and CeO2 during CO hydrogenation forming branched carbon chains, especially isobutene, (over ZrO2), have been investigated by chemical trapping, in situ IR, and solid-state NMR methods. These indicated that methoxide and formate were present as the surface species on ZrO2. CO hydrogenation…
Hydrogen concentrations and hydrogen release activation energies from trap sites were investigated for austenitic stainless steels by thermal desorption spectroscopy. It was found that hydrogen concentrations could be determined by the peak areas of the desorption specrta. A spectrum could be separated into four peaks…
Pyrrole can be polymerized within montmorillonite clays via chemical means utilizing Fe3+ and Cu2+ as the oxidizing species. The resultant composite has properties of both the conducting polymer and the host material. Vibrational spectroscopy, thermal analysis and conductivity data all indicate that polypyrrole is pre…